Trade mags, websites, other resources for newbie tech

[cqrsnv@xxxxxxxxx (jay)]

Hello,

I'm just getting started in the trade (as a tech) and I have been
reading back posts here - only 21,000 more to go!

I'd like to get some opinions (danger Will Robinson, danger) on
several areas of the trade.

1.  Trade Magazines (not to learn nitty gritty but for overview/new
products & technologies)

I signed up for the following and have listed them in my current order
of preference:
Security Dealer
Security Products
SDM
Security Sales & Integration
Security Technology & Design
Security Systems News  (seems to be more  business than tech)

Are there others that I should be looking at?  Are any of the above
known to pander to advertisers?

2.  Websites
I just found the forum at http://www.homesecuritystore.com/ and am
downloading the DSC and Visonic manuals to look over.

What other websites are good?

3.  Of all the brands and makes out there, which ones should a new
tech learn/look at first. I'm a bit confused who owns/recently bought
who.   I'm in Southern Nevada if region matters.

DSC
Visonic
Ademco
Caddx
Linear
ITI
GE
Honeywell
others?

Thanks!

Jay